FR2375772A1 - TELEPHONE SPEAKING CIRCUIT WITH BRIDGE CONFIGURATION - Google Patents
TELEPHONE SPEAKING CIRCUIT WITH BRIDGE CONFIGURATIONInfo
- Publication number
- FR2375772A1 FR2375772A1 FR7737680A FR7737680A FR2375772A1 FR 2375772 A1 FR2375772 A1 FR 2375772A1 FR 7737680 A FR7737680 A FR 7737680A FR 7737680 A FR7737680 A FR 7737680A FR 2375772 A1 FR2375772 A1 FR 2375772A1
- Authority
- FR
- France
- Prior art keywords
- bridge configuration
- circuit
- telephone
- transistors
- speaking circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/58—Anti-side-tone circuits
- H04M1/585—Anti-side-tone circuits implemented without inductive element
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6025—Substation equipment, e.g. for use by subscribers including speech amplifiers implemented as integrated speech networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/738—Interface circuits for coupling substations to external telephone lines
- H04M1/76—Compensating for differences in line impedance
Abstract
La présente invention concerne un circuit de parole téléphonique électrique à configuration en pont. Ce circuit fonctionne avec des tensions très basses aux bornes T et R d'une ligne téléphonique ce qui permet un fonctionnement en parallele avec des postes classiques dans des applications en boucle longue. Le circuit a une configuration en pont utilisant des transistors Q1 et Q2 dans deux de ses branches, ces transistors étant commandés par la sortie de l'émetteur TX, éliminant ainsi les résistances d'équilibrage de pont habituelles et les chutes de tension de fonctionnement concomitantes. Application à l'amélioration des réseaux téléphoniques.The present invention relates to an electric telephone speech circuit having a bridge configuration. This circuit operates with very low voltages at the T and R terminals of a telephone line which allows parallel operation with conventional extensions in long loop applications. The circuit has a bridge configuration using transistors Q1 and Q2 in two of its branches, these transistors being driven by the output of the TX emitter, thus eliminating the usual bridge balancing resistors and the accompanying operating voltage drops. . Application to the improvement of telephone networks.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/754,430 US4071713A (en) | 1976-12-27 | 1976-12-27 | Telephone speech network |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2375772A1 true FR2375772A1 (en) | 1978-07-21 |
FR2375772B1 FR2375772B1 (en) | 1983-01-28 |
Family
ID=25034762
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7737680A Granted FR2375772A1 (en) | 1976-12-27 | 1977-12-14 | TELEPHONE SPEAKING CIRCUIT WITH BRIDGE CONFIGURATION |
Country Status (12)
Country | Link |
---|---|
US (1) | US4071713A (en) |
JP (1) | JPS5382203A (en) |
BE (1) | BE862118A (en) |
DE (1) | DE2757100C2 (en) |
DK (1) | DK577877A (en) |
ES (1) | ES465474A1 (en) |
FI (1) | FI773859A (en) |
FR (1) | FR2375772A1 (en) |
GB (1) | GB1576898A (en) |
NL (1) | NL187376C (en) |
NO (1) | NO774415L (en) |
SE (1) | SE414260B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002032741A1 (en) * | 2000-10-17 | 2002-04-25 | Robert Bosch Gmbh | Zero backlash steering gear |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1546046A (en) * | 1976-12-03 | 1979-05-16 | Cselt Centro Studi Lab Telecom | Transmitting and receiving circuit for subscriber telephone sets |
CA1056970A (en) * | 1977-01-10 | 1979-06-19 | Northern Telecom Limited | Electronic network for telephone set |
DE2807304C2 (en) * | 1978-02-21 | 1982-07-01 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Circuit arrangement for amplifying a signal generated in a terminal of a telecommunications system that is fed from a subscriber line |
JPS5831122B2 (en) * | 1979-01-19 | 1983-07-04 | 仁 伊藤 | mixed circuit |
US4303805A (en) * | 1979-05-21 | 1981-12-01 | United Networks, Inc. | Subscriber station network |
US4400589A (en) * | 1979-05-21 | 1983-08-23 | United Networks, Inc. | Subscriber station network |
US4354060A (en) * | 1979-07-26 | 1982-10-12 | Stromberg-Carlson Corporation | Electronic telephone |
JPS5660151A (en) * | 1979-10-22 | 1981-05-23 | Fujitsu Ltd | Level-compensating type handset unit |
DE2946306A1 (en) * | 1979-11-16 | 1981-05-21 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | AMPLIFIER CIRCUIT WITH VOGEBLE AC INTERNAL RESISTANCE |
US4332984A (en) * | 1979-12-13 | 1982-06-01 | Bell Telephone Laboratories, Incorporated | Active speech network circuit for a telephone set |
JPS6041909B2 (en) * | 1980-03-26 | 1985-09-19 | 日本電気株式会社 | Telephone communication network |
DE3116262A1 (en) * | 1981-04-24 | 1982-11-11 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | "CIRCUIT ARRANGEMENT FOR GENERATING CONTROL SIZES FROM THE LOOP CURRENT" |
IT1218851B (en) * | 1984-10-31 | 1990-04-24 | Ates Componenti Elettron | INTEGRATED CIRCUIT FOR THE TRANSMISSION OF TELEPHONE SIGNALS, WITH LIMITATION OF THE AMPLITUDE OF THE NEGATIVE PEAKS OF THE WAVEFORMS OF THE TRANSMITTED SIGNALS |
JPS6243944A (en) * | 1985-08-21 | 1987-02-25 | Toshiba Corp | Telephone set circuit |
US10447334B2 (en) | 2008-07-09 | 2019-10-15 | Secureall Corporation | Methods and systems for comprehensive security-lockdown |
US10128893B2 (en) | 2008-07-09 | 2018-11-13 | Secureall Corporation | Method and system for planar, multi-function, multi-power sourced, long battery life radio communication appliance |
JP2011527873A (en) | 2008-07-09 | 2011-11-04 | セキュアオール コーポレイション | Low power wireless communication system |
US11469789B2 (en) | 2008-07-09 | 2022-10-11 | Secureall Corporation | Methods and systems for comprehensive security-lockdown |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1518349A (en) * | 1966-05-06 | 1968-03-22 | Western Electric Co | Resistant differential networks for balancing ambient noise in a telephone device |
FR2164377A5 (en) * | 1971-12-09 | 1973-07-27 | Int Standard Electric Corp | |
US3762867A (en) * | 1967-11-17 | 1973-10-02 | Mohasco Ind Inc | Textile printing method |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3462560A (en) * | 1966-04-06 | 1969-08-19 | Bell Telephone Labor Inc | Subscriber telephone circuit with resistance hybrid sidetone balancing network |
BE789514A (en) * | 1971-09-30 | 1973-03-29 | Siemens Ag | INTEGRABLE MONOLITHIC CIRCUIT FOR TELEPHONE CONNECTION OF SUBSCRIBER STATIONS TO CENTRAL POWER SUPPLY |
US3955053A (en) * | 1971-09-30 | 1976-05-04 | Siemens Aktiengesellschaft | Integrated circuit arrangement for a telephone subscriber station |
CA1031882A (en) * | 1976-01-12 | 1978-05-23 | Mevhibe G. Sencer | Telephone speech network for electronic sidetone suppression |
-
1976
- 1976-12-27 US US05/754,430 patent/US4071713A/en not_active Expired - Lifetime
-
1977
- 1977-11-21 GB GB48398/77A patent/GB1576898A/en not_active Expired
- 1977-12-09 NL NLAANVRAGE7713652,A patent/NL187376C/en not_active IP Right Cessation
- 1977-12-14 FR FR7737680A patent/FR2375772A1/en active Granted
- 1977-12-20 FI FI773859A patent/FI773859A/en not_active Application Discontinuation
- 1977-12-21 BE BE183680A patent/BE862118A/en unknown
- 1977-12-21 DE DE2757100A patent/DE2757100C2/en not_active Expired
- 1977-12-22 NO NO774415A patent/NO774415L/en unknown
- 1977-12-23 SE SE7714747A patent/SE414260B/en not_active IP Right Cessation
- 1977-12-23 DK DK577877A patent/DK577877A/en unknown
- 1977-12-27 ES ES465474A patent/ES465474A1/en not_active Expired
- 1977-12-27 JP JP15661977A patent/JPS5382203A/en active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1518349A (en) * | 1966-05-06 | 1968-03-22 | Western Electric Co | Resistant differential networks for balancing ambient noise in a telephone device |
US3440367A (en) * | 1966-05-06 | 1969-04-22 | Bell Telephone Labor Inc | Nonreactive antisidetone network for a telephone set |
US3762867A (en) * | 1967-11-17 | 1973-10-02 | Mohasco Ind Inc | Textile printing method |
FR2164377A5 (en) * | 1971-12-09 | 1973-07-27 | Int Standard Electric Corp | |
US3823272A (en) * | 1971-12-09 | 1974-07-09 | Int Standard Electric Corp | Electronic telephone transmission circuit |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002032741A1 (en) * | 2000-10-17 | 2002-04-25 | Robert Bosch Gmbh | Zero backlash steering gear |
US6860829B2 (en) * | 2000-10-17 | 2005-03-01 | Robert Bosch Gmbh | Play-free steering gear |
Also Published As
Publication number | Publication date |
---|---|
ES465474A1 (en) | 1978-09-16 |
SE414260B (en) | 1980-07-14 |
US4071713A (en) | 1978-01-31 |
JPS5382203A (en) | 1978-07-20 |
DE2757100C2 (en) | 1985-04-04 |
NL7713652A (en) | 1978-06-29 |
JPS6145424B2 (en) | 1986-10-08 |
DK577877A (en) | 1978-06-28 |
FI773859A (en) | 1978-06-28 |
NL187376C (en) | 1991-09-02 |
NO774415L (en) | 1978-06-28 |
FR2375772B1 (en) | 1983-01-28 |
BE862118A (en) | 1978-06-21 |
DE2757100A1 (en) | 1978-07-06 |
SE7714747L (en) | 1978-06-28 |
GB1576898A (en) | 1980-10-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |